Kabushiki Kaisha Toshiba

Wataru Uno

Shinsuke Matsuno

Yasuyuki Hotta

Hayato Seki

Norio Takami

Takashi Kuboki

Ryosuke Yagi

Yuta Kanai

In a diagnosis method of a battery of an embodiment, based on a measurement result of a first impedance of a battery at a first frequency, it is determined, for each of a plurality of SOC values, whether an absolute value of a change ratio of the first impedance to the SOC is not more than a reference value. In the diagnosis method, for a target SOC value whose absolute value of the change ratio is not more than the reference value in the plurality of SOC values, a second impedance of the battery at a second frequency higher than the first frequency is measured. In the diagnosis method, determination concerning the state of the battery is performed based on the measurement results of the first impedance and the second impedance for the target SOC value.

Diagnosis method, diagnosis apparatus, and diagnosis system of battery, and non- transitory storage medium

A separator includes an inorganic particle layer including an inorganic particle, a polymeric binder and a fiber substance. A mass ratio of the fiber substance with respect to a total mass of the inorganic particle, the polymeric binder and the fiber substance is 0.1 mass % or more and 40 mass % or less.

Separator, electrode group, secondary battery, battery pack, vehicle, and stationary power supply

According to one embodiment, a secondary battery () including a positive electrode (), a negative electrode (), a first electrolyte (), and a second electrolyte (). The negative electrode () includes a lithium titanium oxide having a degree of proton substitution of 0.01 to 0.2. The first electrolyte () includes water and in contact with the positive electrode (). The second electrolyte () includes water and in contact with the negative electrode ().

Secondary battery, battery pack, vehicle, and stationary power supply

A secondary battery includes a positive electrode, a first aqueous electrolyte held on the positive electrode, a negative electrode, a second aqueous electrolyte held on the negative electrode, and a separator interposed between the positive electrode and the negative electrode. A difference between an osmotic pressure (N/m) of the first aqueous electrolyte and an osmotic pressure (N/m) of the second aqueous electrolyte is 90% or less (including 0%) of the higher one of the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte.

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Yokohama, Japan

Wataru Uno